org.gloin.example.jrap.useresourceservice
Class StartUserService

java.lang.Object
  |
  +--org.gloin.example.jrap.useresourceservice.StartUserService

public class StartUserService

extends java.lang.Object

Start a simple service which references a resource service in its codebase annotation (i.e. the service proxy is annotated with a jrap url). Steps startup utility takes to perform this task:

Install the jrap protocol handler using org.gloin.resource.protocol.jrap.Handler.install().

Other ways to install the handler include:

• Setting the system property, -Djava.protocol.handler.pkgs=org.gloin.resource.protocol on the command line as described in the java.net.URL documentation.

  Note: The above install method just programmatically appends to this property.

• Put the hacky class, sun.net.www.protocol.jrap.Handler in CLASSPATH.

Create a JrapURLParser using the supplied query string parameter

Create a webserver to serve the bytes of the proxy jar file which resides in the well known location: jar:user-service.jar!/export-jars/user-service-dl.jar.

The httpServer will send the proxy jar file to discovered resource services when this service registers its proxy byte codes with those services.

Please note: the http server is only one way to create an inputstream from which the resource service can read jar file bytes. For example, sending a simple ByteArrayInputStream would also have worked (though it would have the minor drawback of not being able to do chunked data transfer).

Pass a URLInputStream to ResourceRegistration.registerResource to register the bytes of the user service proxy jar file resource

Load the user service class files in an ExportClassLoader from a location not in CLASSPATH. The implementation class for this user defined service is defined in a class loader whose export urls (see ExportClassLoader) are a jrap url built from the query string parameter to this program.

Register with the Jini lookup service.

Constructor Summary

StartUserService()

Method Summary

static void

main(java.lang.String[] args)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StartUserService

public StartUserService()

Method Detail

main

public static void main(java.lang.String[] args)
                 throws java.lang.Exception